Read the passage and then answer the question below.
From A Book About the Theater by Brander Matthews
At the end of the nineteenth century the two masters of the stage were Ibsen and Wagner, and both of them were in the show business—Wagner more openly and more frequently than Ibsen. Yet the stern Scandinavian did not disdain to employ an avalanche in 'When We Dead Awaken,' and to introduce a highly pictorial shawl dance for the heroine of his 'Doll's House.' As for Wagner, he was incessant in his search for the spectacular, insisting that the music-drama was the "art-work of the futu
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As for Wagner, he was incessant in his search for the spectacular, insisting that the music-drama was the "art-work of the future," since the librettist-composer could call to his aid all the other arts, and could make these arts contribute to the total effect of the opera.
To what or whom does the selection in bold refer?
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